78M6612 Hardware Design Guidelines
AN_6612_007
4
Rev 2
Effective 3.3 VDC bypassing incorporates the combination of three different capacitor values. A 1000 pF
in parallel with a 0.1 µF ceramic capacitor must be placed as close as possible to the 78M6612 V3P3A
pin. Place the 1000 pF capacitor should be placed closest to the V3P3A pin of the 78M6612. An
additional 22 µF bulk capacitor is placed in the vicinity of the V3P3SYS pin to provide decoupling for the
external DIO circuitry. Connect the VBAT pin to the V3P3SYS pin or directly to V3P3. These three
capacitor values provide decoupling over a wide frequency spectrum. Do not connect V3P3D to V3P3.
V3P3D only requires a 0.1 µF capacitor to ground.
GNDA
V3P3SYS
VBAT
V3P3A
GNDD
1000pF
0.1
μF
22
μF
V3P3
Place Capacitors
Close to V3P3A
V3P3D
0.1
μF
78M6612
Figure 2: Power S
u
pply Decoupling
